I have some interest in adapting apps to the eink screen, so I will try to help with this. Unfortunately, I cannot post in the dev forums yet.

When you get error installing apps via android UI, it is useful to do via "adb install" to be able to know the error cause. The message was "INSTALL_FAILED_OLDER_SDK", which I solved by lowering the android:minSdkVersion parameter in Manifest. Then, the app installed and ran fine, but didn't do the desired effect yet. I will check the code now...

I see that you're trying to use enterA2Mode() for the nook (btw, there is a typo at NoRefreshEnablerActivity.java:29, it should read EINK_NOOK). I've been playing around with this some time ago when I started developing a fast e-ink drawing app for the NST, you can see it here: https://github.com/marspeople/E-Paper (WIP).

With few testing I've done, I guess the 1-bit mode (A2) setting is not applied globally: it should take effect only in the View from which it is called. I haven't investigated further to try to use it globally.

Thanks for pointing out the type, it should read
} else if (DeviceInfo.EINK_NOOK)

Regarding the global value of mode setting. From what I understand, A2 is a permanent mode, so whatever function or app is setting the updatemode, it is kept. With the PRS-T1, it is reset by calling any stock (Sony) app. For the Nook I don't know..

Good luck in compiling, hopefully we come to a version which works on both devices. Then I can proceed to dynamically change the updatemode within an app.

Yes, the A2 mode is kept until any process resets the EPD. Using logcat, I noticed several epd_reset_region messages appearing automatically when I close your app to go back to the launcher. It seems the system overrides the EPD setting, making impossible to use A2 system-wide (at least by this method).

However, if you want A2 just for an app, calling enterA2mode() will probably work, as I used in my own app above.

I would be most interested to know why the initial source code does compile ok, works on the PRS-T1 and does not install on the Nook Touch + the fixes.

With this knowledge I can write either an app to set refresh modes or within apps.

Did you succeed to compile and install on Nook?

Yes, sorry about the confusion, but I managed to do it, despite the A2 mode didn't work. What I did was just edit the AndroidManifest.xml, changing the android:minSdkVersion parameter to 7 (since the NST runs Android 2.1).

Good luck finding out how to set A2 mode permanently. I guess you don't have a Nook, so feel free to ask me for testing purposes.

Since the Nook A2 mode seems to be overridden when switching foreground activity, I've tried another approach with a background service which toggles A2 mode when requested by user. This way, the foreground activity isn't switched and "fast refreshing" mode works (until you change activity).

This fast refresh mode (called A2) is only possible because it uses only 1-bit depth, i.e, just black on white, meaning you can't see grayscale pictures but it's good enough for black text on white background and scrolling. I have not "created it", it is built-in from the device (you can test using the stock reader, it is activated when holding a page button). What I implemented is a way to activate and deactivate it at user will from inside any app.

Thanks to dairyknight for his N2EpdController class, which made this possible.
Thanks to bardo8430 for bringing the idea.
Thanks to AndroSS source code for screenshots used in automatic contrast.

Changelog:
01/Mar: Now when you launch the app and it is already running, it will activate NoRefresh mode. So you can also use an activation shortcut to the app using NookTouchTools (i.e. B&N's book icon at top left corner).
02/Mar: Improve activation shortcut to perform toggle between modes. Tap gestures aren't needed anymore (use "-noGestures" apk version if you don't want them).
04/Mar: Got rid of initial ghosting by redrawing the screen after activating A2.
04/Mar (2): Minor improvement of removing ghosting at screen edges.
12/Mar (Beta): Now you can adjust contrast in A2 mode. Images shouldn't be dark or black anymore if you raise the contrast a bit.

22/May: Completely redesigned version 2.0:
- Several options can be customized via settings screen.
- NoRefresh can be toggled by manual app shortcut, tap gestures or automatically according to screen animation (new).
- New App Whitelist to avoid unwanted activation in specific apps (except for manual mode).
- Background service can be launched at boot.
- Small improvements and tweaks.
- Custom app icon (finally )

06/Jun: Fix crash on empty whitelist

08/Jul: (Version 2.1)
- Automatic contrast when activating NoRefresh, according to total "brightness" of the screen (simple algorithm). This should ask you for root permission.
- Also supports manual setting in specific situations (customizable).
- Fix possible crash at startup.

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